const arr = [1,2,3,4];
// const num = arr.findIndex(v=>v===3);
// console.log(num);

// let arr2 = arr.map(v=>v+1);
// console.log(arr2);// [2,3,4,5]

let arr2 = arr.map(v=>({
	v
}));
console.log(arr2);
